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Current Fundamental System Errors and Post-Hipparcos Utilization of Ground-Based Optical Instruments

Published online by Cambridge University Press:  07 August 2017

G.A. Goncharov
G.A. Goncharov*
Affiliation:
Pulkovo Observatory 196140, St. Petersburg, Russia

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Several modern ground-based optical instruments have indicated similar systematic differences of their catalogues with respect to the FK5. Thus, the FK5 apparently needs a correction of about 60·sin(6δ) mas for northern hemisphere declinations, other sine corrections of order 20 mas and some equator correction. These errors are the result of systematically erroneous proper motions due to position errors, particularly in old observations.

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Posters
Information
Symposium - International Astronomical Union , Volume 166: Astronomical and Astrophysical Objectives of Sub-Milliarcsecond Optical Astrometry , 1995 , pp. 404
Copyright
Copyright © Kluwer 1995